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3. Using the lower controls completely lower the plat-
form.
Cables and Wiring Harness
To inspect the cables and wiring harness:
1. Visually inspect all cables and wiring for wear and/or
physical damage such as loose connections, broken
wires, and frayed insulation.
2. Check the wiring in areas where a change in routing
direction may cause them to become pinched.
3. Make sure the cables and wires are properly routed
to avoid sharp edges, pinching, and scuffing.
Hydraulic System
Hydraulic power is supplied from a single stage hydraulic
pump with a 4.25 horsepower DC electric motor.
Danger
Hydraulic fluid escaping under pressure can have
enough force to inject fluid into the flesh. Serious
infection or reaction will result if medical treatment is
not given immediately. In case of injury by escaping
hydraulic fluid, seek medical attention at once.
The hydraulic reservoir, pump, and filter are located in the
hydraulic tray on the left side of the chassis. Unlatch and
swing out the tray to inspect the hydraulic components.
Fluid Level
To inspect the fluid level:
1. Make sure the aerial platform is fully stowed on a
level surface. Swing out the hydraulic tray and vi-
sually check to make sure the fluid is visible in the
sight gauge (refer to Figure 8.6). Some machines
may have a fill cap with a dipstick. The fluid must be
visible on the dipstick.
Fill Cap with Strainer
Sight Gauge
Figure 8.6 – Hydraulic Tray
S3215L/S3215E/S3219E/S3220E/S3226E/S4726E/S4732E – 1500834
Chapter 8 – Prestart Inspection
Caution
Not all hydraulic fluid is suitable to use in the hydrau-
lic system. Some have poor lubricating character-
istics and may increase component wear. Only use
hydraulic fluid as recommended.
2. If necessary, add fluid of the proper type.
Note
Refer to Chapter 2 for the proper type and grade of
hydraulic fluid to use. The need to regularly add fluid
indicates a leak that should be corrected.
3. Replace the cap making sure it is secured in place.
Hoses, Tubes, and Fittings
To inspect the hoses, tubes and fittings:
1. Inspect all hydraulic hoses, tubes, and fittings for
wear, leakage, or damage (refer to Figure 8.7).
Diagnostic Center
LCD Display
Free-Wheeling Valve
on Side of Manifold
Normal Operation Fully Closed – CW
Figure 8.7 – Control Valve Tray
Right Side of Chassis
2. Make sure the hoses are properly routed to avoid
sharp edges, kinking, and scuffing.
3. Inspect the tubes for dents or other damage that may
restrict fluid flow.
4. Make sure all hoses and tubes are held firmly in their
support brackets.
5. Check under the chassis for fluid that has leaked.
Hydraulic fluid leaks are easily visible on the ground.
Free-Wheeling Valve
The free-wheeling valve is on the hydraulic manifold in the
control valve tray. On some manifolds the valve is on the
side and on others it is on the back (refer to Figure 8.7).
Check the free-wheeling valve to make sure it is in its
normal operation position.
Free-Wheeling Valve
on Back of Manifold
Normal Operation Fully Open – CCW
29
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